1. Distance between two ends: length.
2, the length is large, as opposed to "short", which refers to space and also refers to time: length. Sky. Long and short sentences (word aliases). Long night (a. Long night; It's a dark day. Breaking the waves (with great interest) Long song cries (with songs).
3, advantages, expertise: specialty. Expertise has its own strengths.
Do sth well: he is good at writing.